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We consider a scheduling problem in which n jobs are grouped into F groups and are to be processed on a single machine. A machine setup time is required when the machine switches from one group of jobs to the other. All jobs have a common due date that needs to be determined. The objective is to find an optimal common due date and an optimal sequence of jobs to minimize the sum of the cost of tardy jobs and the cost related to the common due Beats By Dre Repair Vancouver date. We consider two cases: 1.(i) the jobs have to be processed in groups; and2.(ii) the jobs do not have to be processed in groups. Analytical results are presented and computational algorithms are developed. A 29 year old black man considered to be in good health died suddenly and unexpectedly. Beats Dr Dre Canada At postmortem examination there were no significant gross abnormalities, all drug screens were normal and sicklemia was not present. Special studies of the cardiac conduction system demonstrated isolated acute infarction of the His bundle, with no similar evidence of myocardial infarction anywhere else in the heart. The atrioventricular (AV) node artery was moderately narrowed, but its branch supplying the His bundle was occluded >95% by focal fibromuscular dysplasia. There were no other significant coronary lesions or other abnormalities in the heart.